Even a gravel base need the ground to be sound. The need for gravel under
the concrete all depends on local conditions. Areas where there is poor
drainage and frost will certainly last longer and be better with gravel
under the concrete. I assume that dry, warm areas have less need. All other
areas will vary according to local conditions and practices, but you cannot
go wrong with gravel. Also adding some re bars can add strength and reduce
the tendency to crack, did he quote this or not.
When getting quotes, it is best to provide some written specifications to
the contractor covering gravel, re-rods concrete strength, thickness, then
all the bids are based on the same thing.
What did your local planning, building and zoning office say? You are
getting a permit, right? If you have not contacted your local office
for their services, a service for which you have paid taxes, for this
project you deserve to get taken.
The problems we face today exist because the people who work
for a living are outnumbered by those who vote for a living.
On Fri, 29 Jul 2011 11:40:23 -0500, Gordon Shumway
You must get a permit everytime you turn on your computer. It appears
you do not have such a permit, therefore you have been reported. If
you did indeed posted this message without a valid permit, you will be
investigated and receive a very large fine. You deserve it !!!!
What kind of weight are you going to put on this pad?
A 747 Jumbo Jet?
Do you *really* care if it develops hairline cracks because of frost
heave over the next 10 to 20 years? Is it stamped concrete, or some
sort of fancy acid etched finish?
What's the pad for? A shed? How thick do you want to make it? (it
should be at least 3 inches).
Do you want it to pay more for gravel for most likely no additional
Is the pad located in a low spot in your yard - or a high spot? Does
water pool or accumulate around it?
What is your climate? How cold does it get in the winter?
Do you have any large trees near it?
Are you going to pour it as several sections (5' x 4') separated with
expansion joints or cuts? (if so, then again the need for a gravel base
is reduced to zero).
10 x 8 is small enough to pour as a single slab, without needing joints
or cuts. Throw some rebar in there, use an extra bag of cement to give
it more strength, use a plasticizer or water reducer to make the
concrete stronger, and you'll have a pad that will survive long after
You don't need gravel under it.
Just prepare the ground, rake it flat, smooth and level. Put down a
good thick piece of plastic, nail up your forms and then just pour the
concrete. Ideal temperature is between 55 and 75. Don't pour if it's
hotter than 85 if you have a choice.
You don't need gravel under a 10 x 8 concrete pad.
You also probably don't need a permit from the city either. Not for
something so small (assuming it's a shed). And certainly not for just a
"pad" - no matter how large.
Ok, yes. I focused on the body of the post and not the subject.
I still say that gravel isin't needed, given the size and application.
Putting gravel down without putting a membrane between the gravel and
concrete would also be dumb. I don't know what contractors do in that
regard, but it clearly would be counter-productive to NOT put a membrane
down before pouring.
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